Mercurial > dropbear

annotate libtomcrypt/src/prngs/rng_make_prng.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 6dba84798cd5
children
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 */
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9 #include "tomcrypt.h"
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10
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11 #ifdef LTC_RNG_MAKE_PRNG
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12 /**
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13 @file rng_make_prng.c
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14 portable way to get secure random bits to feed a PRNG (Tom St Denis)
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15 */
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17 /**
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18 Create a PRNG from a RNG
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19 @param bits Number of bits of entropy desired (64 ... 1024)
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20 @param wprng Index of which PRNG to setup
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21 @param prng [out] PRNG state to initialize
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22 @param callback A pointer to a void function for when the RNG is slow, this can be NULL
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23 @return CRYPT_OK if successful
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24 */
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25 int rng_make_prng(int bits, int wprng, prng_state *prng,
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26 void (*callback)(void))
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27 {
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28 unsigned char buf[256];
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29 int err;
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30
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31 LTC_ARGCHK(prng != NULL);
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33 /* check parameter */
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34 if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
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35 return err;
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36 }
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38 if (bits < 64 || bits > 1024) {
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39 return CRYPT_INVALID_PRNGSIZE;
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40 }
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42 if ((err = prng_descriptor[wprng].start(prng)) != CRYPT_OK) {
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43 return err;
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44 }
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46 bits = ((bits/8)+((bits&7)!=0?1:0)) * 2;
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47 if (rng_get_bytes(buf, (unsigned long)bits, callback) != (unsigned long)bits) {
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48 return CRYPT_ERROR_READPRNG;
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49 }
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51 if ((err = prng_descriptor[wprng].add_entropy(buf, (unsigned long)bits, prng)) != CRYPT_OK) {
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52 return err;
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53 }
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55 if ((err = prng_descriptor[wprng].ready(prng)) != CRYPT_OK) {
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56 return err;
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57 }
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59 #ifdef LTC_CLEAN_STACK
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60 zeromem(buf, sizeof(buf));
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61 #endif
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62 return CRYPT_OK;
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63 }
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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64 #endif /* #ifdef LTC_RNG_MAKE_PRNG */
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66
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67 /* ref: $Format:%D$ */
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68 /* git commit: $Format:%H$ */
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69 /* commit time: $Format:%ai$ */